Three energy scales in the superconducting state of hole-doped cuprates detected by electronic Raman scattering

Abstract : We explored by electronic Raman scattering the superconducting state of Bi-2212 single crystal by performing a fine tuned doping study. We found three distinct energy scales in A1g, B1g and B2g symmetries which show three distinct doping dependencies. Above p=0.22 the three energies merge, below p=0.12, the A1g scale is no more detectable while the B1g and B2g scales become constant in energy. In between, the A1g and B1g scales increase monotonically with under-doping while the B2g one exhibits a maximum at p=0.16. The three superconducting energy scales appear to be an universal feature of hole-doped cuprates. We propose that the non trivial doping dependence of the three scales originates from Fermi surface topology changes and reveals competing orders inside the superconducting dome.
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Submitted on : Thursday, July 28, 2016 - 3:49:46 PM
Last modification on : Tuesday, December 10, 2019 - 4:50:13 PM

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S. Benhabib, Y. Gallais, M. Cazayous, M. -A. Measson, R. D. Zhonge, et al.. Three energy scales in the superconducting state of hole-doped cuprates detected by electronic Raman scattering. Physical Review B : Condensed matter and materials physics, American Physical Society, 2015, ⟨10.1103/PhysRevB.92.134502⟩. ⟨cea-01349758⟩

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